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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7b2d95a3975c24f8662c93c17328ad645e0198daf5c26a2ecea1673e2c5782' 
  AND token = 'gY/JLy81iidWlgIvZLDt0kd17Fnb9bGnCDVPK5ChezA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}